add fail safe against invalid string

Author: suin

Source/Suin/RSSWriter/Channel.php

@@ -147,7 +147,7 @@ public function appendTo(FeedInterface $feed)
 	 */
 	public function asXML()
 	{
-		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><channel></channel>');
+		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><channel></channel>', LIBXML_NOERROR|LIBXML_ERR_NONE|LIBXML_ERR_FATAL);
 		$xml->addChild('title', $this->title);
 		$xml->addChild('link', $this->url);
 		$xml->addChild('description', $this->description);

Source/Suin/RSSWriter/Feed.php

@@ -28,7 +28,7 @@ public function addChannel(ChannelInterface $channel)
 	 */
 	public function render()
 	{
-		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0" />');
+		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><rss version="2.0" />', LIBXML_NOERROR|LIBXML_ERR_NONE|LIBXML_ERR_FATAL);
 
 		foreach ( $this->channels as $channel )
 		{

Source/Suin/RSSWriter/Item.php

@@ -107,7 +107,7 @@ public function appendTo(ChannelInterface $channel)
 	 */
 	public function asXML()
 	{
-		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><item></item>');
+		$xml = new SimpleXMLElement('<?xml version="1.0" encoding="UTF-8" ?><item></item>', LIBXML_NOERROR|LIBXML_ERR_NONE|LIBXML_ERR_FATAL);
 		$xml->addChild('title', $this->title);
 		$xml->addChild('link', $this->url);
 		$xml->addChild('description', $this->description);

Tests/Suin/RSSWriter/ItemTest.php

@@ -165,6 +165,20 @@ public function test_with_amp()
 			->description('desc&desc');
 		$expect = '<?xml version="1.0" encoding="UTF-8"?>
 <item><title>test&amp;test</title><link>url&amp;url</link><description>desc&amp;desc</description></item>
+';
+
+		$this->assertSame($expect, $item->asXML()->asXML());
+	}
+
+	public function test_fail_safe_against_invalid_string()
+	{
+		$item = new Item();
+		$item
+			->title("test\0test")
+			->url("url\0test")
+			->description("desc\0desc");
+		$expect = '<?xml version="1.0" encoding="UTF-8"?>
+<item><title>test</title><link>url</link><description>desc</description></item>
 ';
 
 		$this->assertSame($expect, $item->asXML()->asXML());